<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <button @click="news.unshift({id:'004',content:'新增'})">新增</button>
        <ul>
            <li v-for="item, index of news" :key="item.id">
                <p>编号:{{item.id}}</p>
                <p>{{item.content}}</p>
            </li>
        </ul>
    </div>
    <script>
        Vue.config.productionTip = false;
        
        const vm = new Vue({
            el: "#app",
            data() {
                return {
                    news: [
                        { id: "001", content: "今天我们......" },
                        { id: "002", content: "明天要下雨......" },
                        { id: "003", content: "后天要放假......" },
                    ],
                }
            }
        })
</script>
</body>

</html>